Adding interfaces to a BPMN processes
You can add BPMN or UML interfaces to a BPMN process. The
process can reference an interface to use the operation or attributes
in an interface. You can also reference an interface in a different
process or model.
Procedure
- In the Project Explorer view, click a process.
- In the Properties view, on the Interface page, click the Add icon
to create a new
interface or click the Browse icon 
to select and
existing interface. - Click OK.